Alternative use?: Febreze for your sink?

We just got an amusing email from a friend who wanted to share her new kitchen disposal smell fighting secret- Febreze! She said that she tried grinding lemon rinds, pouring bleach, and baking soda- and they would work, but only for a day or so. Then one day she got a weird idea to try spraying a large dose of Febreze and said it's lasted days and she's so excited!

We suspect there may be some food residue in the disposal that still should be thoroughly cleaned out, but are fascinated by this alternative use for this product. Has anyone tried this or have any other tips for managing garbage disposal smells?